Photographic-printing machine.



E. ALTHORBERG. PHOTOGRAPHIC PRINTING MACHINE.

- APPLICATION FILED MAY 13, 1915.

' 1,167,857, I Patented Jan; 11, 1916.

E. f7 THOHBEHG is a specification, reference being UNITED STATES PATENTOFFICE.

m A. rnonnnne. or BISMARCK, NOR H DAKOTA.

rnoroenarnrc-rmnrme macnnm -machine for use in-printing pictures eitherI from plates or films, and in which electric lightis used as a printingagent.

The primary ob ect of my invention is to provide a very simple, compact,and effective printing machine, particularly adapted for small negativesand including a casing provided in its bottom with an electric light andhaving ,a'cover, which, when closed down to confine the negative andsensitized paper in a position, to be printed, will automatically closethe circuit through the light, and which, when opened to remove theprinted picture and film, will automatically break the circuit throughthe light.

A further object of the invention is the provision, in connection witha-photographic printing casing of the character described, of meanswhereby. a dry battery may be supported within the casing whereby toenergize the electric lamp mounted therein.

A further object of this invention-is to provide a manually actuatableswitch in con- 'nection witha lamp circuit as well as a switchcontrolled by the opening and closing of the cover of the casing wherebythe circuit through the lamp may be broken by the actuation of theswitch, and in this connection to provide akey, which, when removed,will break said circuit, and which, when in place, will close the gap inthe circuit.

A further object of the invention is to so construct the machine that itmay be used either for printing from filmsv or fromplates. 7

Still another object of the invention is to provide means whereby theelectric lamp mounted within the casing may be electrically connected toanysource of power exterior to the casing where it is not powble ordesirable to use the dry batteries previously referred to.

Other objects the following description.

Specification of Letters 2atent. Application filed May 18, 1915. SerialNo. 27,853.

- corner of the casing; Fig. 5 is a fra sectional view of one end wallof t e casing showing the key switch whereby the circuit will appear inthe course of Patented Jan. 11, 1916.

My invention is illustrated in the accompanying drawing, wherein:

Flgure 1 is a perspective view of my photographic printin device; Fig. 2is a vertical section thereo parallel to the front of the casin andlooking toward the front thereof; g. 3 is a fragmentary sectional viewof one end wall of the .casing, showing the means for raising the cover;Fig. 4 is a fragmentary sectional view of the rear lower through thelamp is closed.

Referring to these drawings, 2 designates a box or casing which is shownas rectangular in form and which may be made of any.

suitable material, such as wood or metal, but which will be preferablymade of wood. Disposed below the upper edge of the side wall of thecasing is a ledge or flange 3 adapted to support a glass plate. Mountedupon the upper end of the casing is a cover 4 which ispreferably hingedto the casing,

as at 5. Attached to-this cover upon its inside face is a strip of clothor felt, designated 6.

' The bottom 7 of the casing 2 is likewise hinged to the casing byhinges 8 so that the bottom may be. opened up, and mounted upon thisbottom are the spring fingers 9 for detachably supporting a dry batteryin place upon the bottom 7. Disposed above the bottom 7 in spacedrelation thereto is a false bottom 10, upon which is mounted a socket 11for the reception of an electric lamp base, and preferably made in onepiece with this socket is a reflector 12 which is oblong or oval inform.

The socket 11 is adapted tobe connected to a dry battery 11 by means ofa wire or conductor '13 which is arranged in any suitable manner withinthe space between the bottom -10 and the false bottom and which isadapted to operatively engage 'one of the Egles of the battery 11. Thelamp 14 may of any suitable character, but preferably 1a tungsten lampis used, and one of the terminals of. this lamp is adapted toelectrically engage a sprmg contact 15, mounted upon the lower face ofthe false bottom 10, this sprin contact being in turn electricallz1 enga'ch leads with a conductor or wire 16 w entary upward in any suitablemanner through the casing or box, as for instance through channelsformed in the side wall of the box, to a spring contact 17 constitutinga normally open switch or circuit breaker which coacts with the contact18, this contact 18 being in turn connected by means of a wire 19 to theother pole of the battery in a manner which will be later stated.

The spring contact 17 and the contact 18 are preferably mounted in arecess 20 formed in the upper edge of the box, preferably upon its frontwall. When the cover 4; is entirely closed the front edge of the coverwill contact with the spring 17, causing it to electrically engage thecontact 18 and close the circuit through the lamp. When the cover israised, however, the spring 17 breaks the circuit through the lamp andbattery.

Preferably the wire 19 leads to a metallic sleeve 21 which is mounted inthe wall of the casing 2 and which is spaced from a spring contact 22,this spring contact being in turn electrically connected by means of awire 23 to the opposite pole of the battery to which the wire 13 isconnected. There is thus a break in the circuit between the battery andthe lamp, not only between the spring 17 and the contact member 18 butbetween the sleeve 21 and the contact 22,

and this gap, between the sleeve 21 and the contact 22 is closed bymeans of a key 24 which is insertible into the end of the box through akey hole 25, and this key, when inserted, will close the gap at thispoint. The key is formed with a notch 24 in it, and a spring 24 justinside of the key hole opening engages with the notch and holds the keyfirmly in place but permits the key to be readily withdrawn. The key 24practically constitutes a switch manually operable for the purpose ofbreaking the circuit of the lamp even though the cover is securelyclosed, thereby saving the battery. Until the key is inserted in the keyhole 25 there is no possible chance of the battery being used .up byhaving the cover of the machine closed. Preferably the cover is urged toa partly open position by means of-a spring actuated plunger 26 mountedin a recess in the end wall of the casing 2, and the cover may be helddown or closed either by hand or by means of a latch 27.

Preferably, and in order that the machine may be connected to a sourceof electricity exterior to the casing or box, I connect the wires 23 and13 by wires 28 and 29 to binding posts 30. By this means the batteries,such as ordinary dry cells, storage batteries, or batteries used onautomobiles, may be connected to the machine, or the machine may be usedin connection with electric lighting.

In the practical use of my invention when printing from film negatives,the film and sensitized paper are disposed in the usual manner upon aglass plate 31 which is sup ported upon the ledge 3. Immediatelythereafter the cover 4; is closed and this, through its engagement withthe spring 17, closes the circuit through the lamp and battery, providedof course that the key 2 1 has been previously inserted in position.After a sufficient time has elapsed, the cover is released, whereupon itwill immediately spring up under the action of the spring pressedplunger 26, and the "circuit through the lamp will be broken. Thenegative and print may be thenremoved and a new film substituted. Wherea plate negative is used the glass plate 31 is of course dispensed with.i

In the practical use of my machine I intend that it shall be equippedwith an ordinary dry cell or set of cells of small voltage, as forinstance, about four volts, together with an electric bulb of the samevoltage. It is, of course, to be understood that the invention is not.limited to any voltage. Of course when a storage battery is connected tothe lamp, a lamp of the same voltage as the storage battery must beused.

This printing machine is of particular advantage to those who do notlive where electric light is available, and by its use prints fromnegatives of medium denseness may be made in from eight to twelve secand, therefore there is no possible chance of the battery. being used upwithout doing its roper work.

aving thus described my invention,

what I claim is:

1. In a photographic printing machine, a casing having a bottom movablyconnected therewith and a false bottom spaced from the first namedbottom, a lamp operatively supported upon the false bottom, means 1n thecasing disposed above the lamp for supporting a negative and sensitizedsheet, a cover movably connected to the casmg, means in the spacebetween the first named bottom and false bottom for supplying the lampwith electricity, and a normally open switch in said casing and in thelamp cir- .cuit, said switch being engageable by the negative andsensitized sheet, a cover mov-- ably connected to the casing, a batteryremovably disposed-upon the first named bottom, means for electricallyconnecting one of the poles of said battery to one of the lamp contacts,means for velectrically connecting the otherpole of said battery to theother contact of the lamp, including a spring member with which the baseof the lamp is adapted to engage, and normally spaced contacts mountedupon the upper edge of the casing and included in said connecting meansand adapted to be placed in electrical engagement with each other by theclosing of the cover;

3. In a photographic printing machine, a

casing having a hinged bottom, a false bottom disposed above the hingedbottom, a lamp operatively 'supported'upon the false bottom, means inthe casing dlsposed above the lamp for supporting a negative andsensitized sheet, a cover hinged to the casing, a battery removablydisposed upon the hinged bottom, means for electrically connecting oneof the poles ofsaid battery to one of the lamp contacts, and means forelectrically connecting the other pole of said battery to the othercontact of said lamp including a spring member with which the signaturein the presence of two. witnesses.

ERIC A. THORBERG.

Witnesses: LILLIAN C. THonBnRe, IDA K. THORBERG.

